diff --git a/source/build/include/build.h b/source/build/include/build.h
index 9bb875be1..301bc51bf 100644
--- a/source/build/include/build.h
+++ b/source/build/include/build.h
@@ -1092,7 +1092,6 @@ void    renderSetRollAngle(int32_t rolla);
 void tileInvalidate(int16_t tilenume, int32_t pal, int32_t how);
 
 void polymost_glreset(void);
-void polymost_precache(int32_t dapicnum, int32_t dapalnum, int32_t datype);
 void PrecacheHardwareTextures(int nTile);
 void Polymost_Startup();
 
@@ -1125,7 +1124,6 @@ EXTERN_CVAR(Bool, hw_useindexedcolortextures)
 EXTERN_CVAR(Bool, hw_parallaxskypanning)
 EXTERN_CVAR(Bool, r_voxels)
 
-extern int32_t r_parallaxskyclamping;
 extern int32_t r_downsize;
 extern int32_t mdtims, omdtims;
 extern int32_t glrendmode;
diff --git a/source/build/include/mdsprite.h b/source/build/include/mdsprite.h
index a6ab29fbd..454f953cc 100644
--- a/source/build/include/mdsprite.h
+++ b/source/build/include/mdsprite.h
@@ -199,7 +199,6 @@ struct voxmodel_t : public mdmodel_t
 
 EXTERN mdmodel_t **models;
 
-void updateanimation(md2model_t *m, tspriteptr_t tspr, uint8_t lpal);
 FTexture* mdloadskin(idmodel_t* m, int32_t number, int32_t pal, int32_t surf, bool* exact);
 void mdinit(void);
 void freeallmodels(void);
diff --git a/source/build/include/polymost.h b/source/build/include/polymost.h
index 4b5153abf..7ed08e9d9 100644
--- a/source/build/include/polymost.h
+++ b/source/build/include/polymost.h
@@ -14,12 +14,10 @@ typedef struct { float r, g, b, a; } coltypef;
 extern bool playing_rr;
 extern int32_t rendmode;
 extern float gtang;
-extern float glox1, gloy1;
+extern float glox1;
 extern double gxyaspect;
 extern float grhalfxdown10x;
 extern float gcosang, gsinang, gcosang2, gsinang2;
-extern float gchang, gshang, gctang, gstang;
-extern float gvrcorrection;
 
 extern void Polymost_prepare_loadboard(void);
 
@@ -40,9 +38,6 @@ void polymost_completeMirror();
 int32_t polymost_maskWallHasTranslucency(uwalltype const * const wall);
 int32_t polymost_spriteHasTranslucency(tspritetype const * const tspr);
 
-float* multiplyMatrix4f(float m0[4*4], const float m1[4*4]);
-
-void polymost_glinit(void);
 void polymost_glreset(void);
 
 enum {
@@ -117,14 +112,7 @@ enum {
 #define DAMETH_NARROW_MASKPROPS(dameth) (((dameth)&(~DAMETH_TRANS1))|(((dameth)&DAMETH_TRANS1)>>1))
 EDUKE32_STATIC_ASSERT(DAMETH_NARROW_MASKPROPS(DAMETH_MASKPROPS) == DAMETH_MASK);
 
-extern int32_t globalnoeffect;
-extern int32_t drawingskybox;
-extern int32_t hicprecaching;
 extern float fcosglobalang, fsinglobalang;
 extern float fxdim, fydim, fydimen, fviewingrange;
 
-extern char ptempbuf[MAXWALLSB<<1];
-
-extern hitdata_t polymost_hitdata;
-
 #endif